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Effects of galvanized steel types on cathodic electrocoating

Our experience shows different adhesion quality of e-coating paint, on different galvanized steels (we work with many suppliers from many resources), appearance differs in spangle size, but this is not significant. I would appreciate if anybody can contribute from his experience to this topic to help us avoid failures.

Ayala Zohar
coating - Ein Hashofet, Meggido, ISRAEL
2004

Hello Ein. The biggest issue is the post-treatment--whether the material has received a chromate conversion coating, a phosphate coating, or neither. Galvanized surfaces that are to be painted should not be chromate conversion coated. The galvanizers associations--I think www.galvanizeit.org is a good starting point--have booklets covering the painting of galvanized surfaces, which they refer to as 'duplex coating'. Even better than galvanizing, though, is galvanneal; it is annealed after galvanizing to further diffuse the iron and zinc for a more paintable surface. Good luck.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2004

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